Consider the E-R diagram for the university database given below. Answer the following questions:

1. Name one weak entity set.

2. Name one recursive relationship set.

3. What does the double line that joins the entity set instructor with the relationship set inst_dep indicate?

course dept inst dept instructor name salary teaches course course id Sec Course title credits prereq prereq id course id department dept name building budget stud dept student ID advisor name tot cred takes grade section time slot sec id. semester sec time slot time slot id day start time end time sec class classroom build in room number capacity